PHP 7 with phpmyadmin gives lots of Deprecation Notices

You can use another PPA for phpmyadmin.Here it is PPA Link

sudo add-apt-repository ppa:nijel/phpmyadmin
sudo apt update
sudo apt install phpmyadmin

As it is only a temporary solution or not a optimal one, till the package of phpmyadmin in ubuntu repos are rebuild.

I had this problem and solved it with a simple reinstall of phpmyadmin and its dependencies. Run the following commands:

sudo apt-get remove --purge phpmyadmin php-gettext php-mbstring -y
sudo apt-get autoremove -y
sudo apt-get update
sudo apt-get install phpmyadmin php-gettext php-mbstring -y

Once reinstalled, you should be good as new!

The way I fixed this problem was by following the askubuntu instructions at depreciation notice error in phpmyadmin with 16.04. It involves changing three lines in /usr/share/php/php-gettext/streams.php and one line in /usr/share/php/php-gettext/gettext.php.

From that link, this are the changes you need to do (if you have ubuntu 16.04):

sudo nano /usr/share/php/php-gettext/streams.php

Line 48 StringReader Error.

Go to Line 52 and change

function StringReader ($str='') {

TO

function __construct($str='') {

Line 84 FileReader Error

Go to Line 90 and change

function FileReader($filename) {

to

function __construct($filename) {

Line 145 CacheFileReader error

Go to Line 146 and change

function CachedFileReader($filename) {

to

function __construct($filename) {

Using sudo nano /usr/share/php/php-gettext/gettext.php.

Line 36 gettext_reader { error

I think you get the gist now, go to line 101 and change

function gettext_reader($Reader, $enable_cache = true) {

To

function __construct($Reader, $enable_cache = true) {

You should try in your php.ini to set error_reporting = ~E_DEPRECATED, this will remove deprecation errors. It should be similiar to error_reporting = ~E_DEPRECATED & E_ALL. Please let me know if it works.